Save & Share

  • Current Version: 1
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
Sponsors
There are currently no sponsors. Become a sponsor today!
An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
Processing...

Test String

Code Generator

Language

Generated Code

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`(?m)([a-zA-Z0-9-]+\.{1,}[a-zA-Z0-9-]+\.[a-zA-Z0-9-]{2,})`) var str = `Received: by with SMTP id gx4so163592215ieb.1 for mail-ie0-x247.google.com <myemailaddress@gmail.com>; Mon, 01 Jun mail-ie0-x247.google.com 2015 18:34:50 -0700 (PDT) max.google.com Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.server.com (Postfix) with ESMTP id 822B1190A4AF for <alex@example.com>; Tue, 17 Feb 2015 13:13:54 +0000 (UTC) Received: from [x.x.x.x] by mail.kampl.com (Cipher TLSv1.2:AES-SHA:128) (MDaemon PRO v15.0.1) b-app05-06.boldchat.com ns126a.ba1.enops.net ms-out.evernote.com obeml1.aerlingus.com NHQSDFEXCHUB01.nam.coair.com ncsmcexchub01.nam.coair.com o1.em.thetaoofbadass.com` for i, match := range re.FindAllString(str, -1) { fmt.Println(match, "found at index", i) } }

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Golang, please visit: https://golang.org/pkg/regexp/